A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5895-01-192-3138
NSN 5960-01-426-4242
NSN 6320-00-823-2015
NSN 5999-00-305-6732
NSN 6610-00-478-2815
NSN 6145-01-240-8993
NSN 4140-01-447-3141
NSN 6220-00-276-8681
NSN 6610-01-224-7247
NSN 6145-01-370-9785
NSN 6685-01-356-3564
NSN 5975-00-275-1962